Lean Body Mass Calculator
Estimate your lean body mass from height, weight, and sex.
Lean body mass (Boer)
56 kg
Body fat implied
20.0%
Fat mass
14 kg
What LBM includes
Lean body mass is everything that isn't fat: muscle, bone, organs, and water. The Boer formula estimates it from height and weight and is the version used clinically for drug dosing. It can't see individual muscularity — very lean or very muscular people will read low.
Why track it
In a diet, the goal is losing fat while holding LBM — adequate protein and resistance training are the levers. Comparing LBM estimates over months (same formula, same conditions) shows whether weight loss is coming from the right place.
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